扩张Array 判断包含对象以及其索引

import Foundation

extension Array {
    func contains(object:AnyObject!) -> Bool {
        if(self.isEmpty) {
            return false
        }
        let array: NSArray = self.bridgeToObjectiveC();

        return array.containsObject(object)
    }

    func indexOf(object:AnyObject!) -> Int? {
        var index = NSNotFound
        if(!self.isEmpty) {
            let array: NSArray = self.bridgeToObjectiveC();
            index = array.indexOfObject(object)
        }
        if(index == NSNotFound) {
            return Optional.None;
        }
        return index
    }

    //#pragma mark KVC

    func getKeyPath(keyPath: String!) -> AnyObject! {
        return self.bridgeToObjectiveC().valueForKeyPath(keyPath);
    }
}